Mastering OpenStack
Omar Khedher
Managing Windows Servers With Chef
John Ewart
Operating System Concepts 8th Edition
Abraham Silberschatz & Peter B. Galvin & Greg Gagne
Operating System Concepts (2)
Building DMZs for Enterprise Networks
Robert J. Shimonski & Will Schmied & V Chang & Thomas W. Shinder
Puppet 3. 0 Beginner's Guide
John Arundel